.page-about {
  --about-rail: 264px;
  --about-gap: clamp(40px, 5vw, 72px);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 48px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(760px 420px at 84% -8%, rgba(36, 224, 178, 0.18), transparent 62%),
    radial-gradient(620px 380px at 4% 112%, rgba(255, 107, 74, 0.16), transparent 64%),
    var(--ink);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(157, 180, 198, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(157, 180, 198, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(circle at 78% 24%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 78% 24%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 26px;
}

.page-about .about-hero-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--jade);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 5.4vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 章节锚点条 ---------- */
.page-about .about-anchors {
  background: var(--harbor);
  border-bottom: 2px solid var(--line);
}

.page-about .about-anchors-inner {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-top: 14px;
  padding-bottom: 14px;
  scrollbar-width: none;
}

.page-about .about-anchors-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-anchor {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-anchor::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
}

.page-about .about-anchor:hover,
.page-about .about-anchor:focus-visible {
  color: var(--paper);
  border-color: var(--jade);
  background: rgba(36, 224, 178, 0.12);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  background: var(--ink);
}

.page-about .about-layout-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 6vw, 52px);
  padding-top: clamp(48px, 7vw, 92px);
  padding-bottom: clamp(48px, 7vw, 92px);
}

/* ---------- 左窄栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 26px;
  align-content: start;
}

.page-about .about-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--jade);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 20px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--coral), var(--jade) 62%, rgba(157, 180, 198, 0.18));
}

.page-about .about-timeline li {
  position: relative;
  display: grid;
  gap: 4px;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--jade);
}

.page-about .about-timeline-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--paper);
}

.page-about .about-timeline-note {
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-rail-card {
  padding: 18px 18px 10px;
  border: 2px solid var(--line);
  border-top: 4px solid var(--coral);
  background: rgba(11, 44, 70, 0.72);
  box-shadow: 6px 6px 0 var(--void);
}

.page-about .about-rail-card dl {
  margin: 0;
}

.page-about .about-rail-card dl > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-rail-card dl > div:last-child {
  border-bottom: 0;
}

.page-about .about-rail-card dt {
  font-size: 0.82rem;
  color: var(--mist);
}

.page-about .about-rail-card dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--paper);
  white-space: nowrap;
}

/* ---------- 右侧叙事流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(40px, 6vw, 68px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 20px);
  min-width: 0;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--coral);
}

.page-about .about-kicker::after {
  content: "";
  width: 44px;
  height: 2px;
  background: var(--dual);
}

.page-about .about-chapter h2 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.42rem, 3.4vw, 2.1rem);
  line-height: 1.3;
  color: var(--paper);
  max-width: 22em;
}

.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 0.98rem;
  line-height: 1.95;
  color: rgba(242, 245, 243, 0.82);
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter a {
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 178, 0.45);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-chapter a:hover,
.page-about .about-chapter a:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.page-about .about-after-list {
  margin-top: 20px;
  padding-left: 16px;
  border-left: 3px solid var(--teal);
}

/* ---------- 全宽引言带 ---------- */
.page-about .about-break {
  padding: clamp(26px, 4.5vw, 42px) clamp(18px, 3vw, 34px);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: linear-gradient(118deg, rgba(255, 107, 74, 0.18), rgba(36, 224, 178, 0.14) 68%, rgba(242, 184, 75, 0.1));
}

.page-about .about-break p {
  margin: 0;
  max-width: 32em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.1rem, 2.8vw, 1.6rem);
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 分类列表 ---------- */
.page-about .about-taxonomy {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-taxonomy li {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--jade);
  background: rgba(11, 44, 70, 0.5);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-taxonomy li:hover {
  border-color: rgba(36, 224, 178, 0.6);
  background: rgba(11, 44, 70, 0.85);
  transform: translateX(3px);
}

.page-about .about-tax-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.85rem;
  line-height: 1;
  padding-top: 2px;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--coral);
}

.page-about .about-taxonomy h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .about-taxonomy p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: none;
}

/* ---------- 阶段卡 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-stage {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px;
  border: 2px solid var(--line);
  background: rgba(14, 59, 69, 0.42);
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--dual);
}

.page-about .about-stage-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-stage h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .about-stage p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: none;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 var(--void);
  background: var(--harbor);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: rgba(6, 26, 46, 0.65);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 团队折叠 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 10px;
  margin: 26px 0 0;
}

.page-about .about-team {
  padding: 0 18px;
  border: 2px solid var(--line);
  background: rgba(11, 44, 70, 0.5);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-team[open] {
  border-color: rgba(36, 224, 178, 0.65);
}

.page-about .about-team summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-team summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--jade);
}

.page-about .about-team[open] summary::before {
  content: "–";
  color: var(--coral);
}

.page-about .about-team summary span {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-team p {
  margin: 0 0 18px;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(46px, 7vw, 84px) 0;
  background: var(--harbor);
  border-top: 2px solid var(--line);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout-inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-break {
    margin-left: calc(-1 * (var(--about-rail) + var(--about-gap)));
    padding-left: clamp(20px, 3vw, 40px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-taxonomy li,
  .page-about .about-team,
  .page-about .about-anchor {
    transition: none;
  }

  .page-about .about-taxonomy li:hover {
    transform: none;
  }
}
<<<END>>>